Ahhh, good thread.  I need to get one soon as well.

After several days of lightening storms, I didn't realize the surge supressor had been hit by lightening and it took out my computer.  Power supply, motherboard and RAM all fried.

At least it didn't get my hard drives, but those and the video card were the only salvageable parts.

I got a new computer out of it, but it was still a seriously trying time and I need to put a UPS on this new one to avoid the same thing.  Clearly, a surge supressor alone isn't enough.